CVE-2026-54403
HIGHCVSS 8.6/10EPSS 0.48%
Last modified
CVE-2026-54403 is a high-severity vulnerability rated 8.6/10 on the CVSS scale. A malicious actor with access to the network could exploit a Path Traversal vulnerability found in certain devices running UniFi OS to bypass authentication of such UniFi OS devices or instances.. EPSS estimates a 0.48% chance of exploitation in the next 30 days.
Description
A malicious actor with access to the network could exploit a Path Traversal vulnerability found in certain devices running UniFi OS to bypass authentication of such UniFi OS devices or instances.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Ui | Unifi Os Server | <= 5.1.15 |
| Ui | Unifi Dream Machine Firmware | <= 5.1.15 |
| Ui | Unifi Dream Machine Pro Firmware | <= 5.1.15 |
| Ui | Unifi Dream Machine Special Edition Firmware | <= 5.1.15 |
| Ui | Unifi Dream Machine Pro Max Firmware | <= 5.1.15 |
| Ui | Unifi Dream Machine Beast Firmware | <= 5.1.15 |
| Ui | Enterprise Fortress Gateway Firmware | <= 5.1.15 |
| Ui | Unifi Dream Router Firmware | <= 5.1.15 |
| Ui | Unifi Dream Wall Firmware | <= 5.1.15 |
| Ui | Unifi Dream Router 7 Firmware | <= 5.1.15 |
| Ui | Unifi Express 7 Firmware | <= 5.1.15 |
| Ui | Unifi Cloudkey Firmware | <= 5.1.15 |
| Ui | Unifi Cloud Key Plus Firmware | <= 5.1.15 |
| Ui | Unifi Cloudkey Enterprise Firmware | <= 5.1.15 |
| Ui | Unifi Network Video Recorder Firmware | <= 5.1.15 |
| Ui | Unifi Network Video Recorder Pro Firmware | <= 5.1.15 |
| Ui | Unifi Network Video Recorder Instant Firmware | <= 5.1.15 |
| Ui | Enterprise Network Video Recorder Firmware | <= 5.1.15 |
| Ui | Enterprise Network Video Recorder Core Firmware | <= 5.1.15 |
| Ui | Unifi Network Video Recorder G2 Firmware | <= 5.1.15 |
| Ui | Unifi Network Video Recorder G2 Pro Firmware | <= 5.1.15 |
| Ui | Unifi Cloud Gateway Ultra Firmware | <= 5.1.15 |
| Ui | Unifi Cloud Gateway Max Firmware | <= 5.1.15 |
| Ui | Unifi Cloud Gateway Industrial Firmware | <= 5.1.15 |
| Ui | Unifi Cloud Gateway Fiber Firmware | <= 5.1.15 |
| Ui | Unas 2 Firmware | <= 5.1.16 |
| Ui | Unas 4 Firmware | <= 5.1.16 |
| Ui | Unas Pro Firmware | <= 5.1.16 |
| Ui | Unas Pro 4 Firmware | <= 5.1.16 |
| Ui | Unas Pro 8 Firmware | <= 5.1.16 |
| Ui | Enterprise Firewall Core Firmware | <= 5.1.18 |
| Ui | Unifi Dream Router 5g Max Firmware | <= 5.1.15 |
References
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-54403?
A malicious actor with access to the network could exploit a Path Traversal vulnerability found in certain devices running UniFi OS to bypass authentication of such UniFi OS devices or instances.
How severe is CVE-2026-54403?
CVE-2026-54403 has a CVSS score of 8.6/10 (HIGH severity). The EPSS model estimates a 0.48% probability of exploitation in the next 30 days.
How do I fix CVE-2026-54403?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-54398An authorization flaw in MISP’s object add/edit handling all…5.3
- CVE-2026-54399Uncontrolled Resource Consumption vulnerability in the HTTP/…7.5
- CVE-2026-5440A memory exhaustion vulnerability exists in the HTTP server …7.5
- CVE-2026-54400A malicious actor with access to the network and high privil…9.1
- CVE-2026-54401A malicious actor with access to the network and low privile…8.8
- CVE-2026-54402A malicious actor with access to the network and low privile…8.8
- CVE-2026-54404A malicious actor with access to the network and low privile…8.8
- CVE-2026-54405A malicious actor with access to the network could exploit a…7.5
- CVE-2026-54406A malicious actor with access to the network and high privil…8.7
- CVE-2026-54407A malicious actor with access to the network could exploit a…8.6
- CVE-2026-54408A malicious actor with access to the network could exploit a…9.8
- CVE-2026-54409A malicious actor with access to the network and under certa…8.1
Are you affected by CVE-2026-54403?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST